From c2a5f031384f84ff1b6ac5e4aa4d29259805d3f0 Mon Sep 17 00:00:00 2001
From: Aaron Ye <aye@ambiq.com>
Date: Mon, 25 Sep 2023 12:11:34 +0800
Subject: [PATCH] boards: arm: apollo4p_blue_kxr_evb: Enable I2C.

This commit enables I2C instance for apollo4p_blue_kxr_evb board.
Also adds pin configuration for each instance.
IOM4 is used for Bluetooth HCI-SPI inside of chip.
So no i2c4_default is defined.

Signed-off-by: Aaron Ye <aye@ambiq.com>
---
 .../apollo4p_blue_kxr_evb-pinctrl.dtsi        | 56 +++++++++++++++++++
 .../apollo4p_blue_kxr_evb.dts                 |  8 +++
 2 files changed, 64 insertions(+)

diff --git a/boards/arm/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb-pinctrl.dtsi b/boards/arm/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb-pinctrl.dtsi
index 840f2343310..b171a065bca 100644
--- a/boards/arm/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb-pinctrl.dtsi
+++ b/boards/arm/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb-pinctrl.dtsi
@@ -16,4 +16,60 @@
 			input-enable;
 		};
 	};
+	i2c0_default: i2c0_default {
+		group1 {
+			pinmux = <M0SCL_P5>, <M0SDAWIR3_P6>;
+			drive-open-drain;
+			drive-strength = "0.5";
+			bias-pull-up;
+		};
+	};
+	i2c1_default: i2c1_default {
+		group1 {
+			pinmux = <M1SCL_P8>, <M1SDAWIR3_P9>;
+			drive-open-drain;
+			drive-strength = "0.5";
+			bias-pull-up;
+		};
+	};
+	i2c2_default: i2c2_default {
+		group1 {
+			pinmux = <M2SCL_P25>, <M2SDAWIR3_P26>;
+			drive-open-drain;
+			drive-strength = "0.5";
+			bias-pull-up;
+		};
+	};
+	i2c3_default: i2c3_default {
+		group1 {
+			pinmux = <M3SCL_P31>, <M3SDAWIR3_P32>;
+			drive-open-drain;
+			drive-strength = "0.5";
+			bias-pull-up;
+		};
+	};
+	i2c5_default: i2c5_default {
+		group1 {
+			pinmux = <M5SCL_P47>, <M5SDAWIR3_P48>;
+			drive-open-drain;
+			drive-strength = "0.5";
+			bias-pull-up;
+		};
+	};
+	i2c6_default: i2c6_default {
+		group1 {
+			pinmux = <M6SCL_P61>, <M6SDAWIR3_P62>;
+			drive-open-drain;
+			drive-strength = "0.5";
+			bias-pull-up;
+		};
+	};
+	i2c7_default: i2c7_default {
+		group1 {
+			pinmux = <M7SCL_P22>, <M7SDAWIR3_P23>;
+			drive-open-drain;
+			drive-strength = "0.5";
+			bias-pull-up;
+		};
+	};
 };
diff --git a/boards/arm/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb.dts b/boards/arm/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb.dts
index 93a55c4bc44..3f73bd219bc 100644
--- a/boards/arm/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb.dts
+++ b/boards/arm/apollo4p_blue_kxr_evb/apollo4p_blue_kxr_evb.dts
@@ -34,3 +34,11 @@
 &wdt0 {
 	status = "okay";
 };
+
+&iom0 {
+	compatible = "ambiq,i2c";
+	pinctrl-0 = <&i2c0_default>;
+	pinctrl-names = "default";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	status = "okay";
+};